1. For two adult axolotls, a minimum of 30 gallons is best. Longer aquariums that have more "floor space" are better because axolotls spend the vast majority of their time on the bottom of the tank. Length and width are more important than height.
2. This can depend on a couple of things such as age and your water temp. In general though you can feed sub adults every or every other day, adults every other or once every 3 days, and babies should be fed at least once a day. They can eat less in cooler temps. As long as their head is roughy the same width as their body though, you should be good.
3. If the size difference is big enough, axolotls of any size or age can be cannibalistic. Babies tend to be a bit more prone to cannibalism than adults sometimes.
4. When they're fully grown, you might need bigger hides than you expected
Some good hides are PVC pipes that are around 4 inches in diameter, or large Tupperware containers flipped upside down with a hole cut in the side. My axolotls favorite hide is a terra cotta pot with a U-shaped entrance hole cut out of the side of the top, and then flipped upside down so it makes a very secluded little cave. (I used a grinder but a hammer will work too, it'll be more likely to break though) A lot of people just put the pot on its side but my axolotl never used it like that. At first, I got the second smallest size of terra cotta pot, but eventually I had to get a size up because the other one got too cramped for her.
5. They don't need any special lighting. You can use a light if you'd like, just make sure it isn't too bright and that it's not on all the time. Axolotls prefer it dim since they don't have any eyelids.
6. Sorry, this ones a little vague to me, though. Do you mean like what filters are best, or what dechlorinator, or what accessories like air stones, etc. Lol, sorry I couldn't be better help on this one!
Anything else you'd like answered, just ask
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